In-Game Description

The blade of this greatsword shines like the brilliant rays of the moon.
In the oldest legends, rarely spoken of today,
it is said that the sword was born of a great white being.
The strong attack unleashes its strength, launching a wave of moonlight.

NOTE: All heavy attacks with magical projections cost 10 durability, one handed or two handed. This can be reduced to 5 with the use of a Bracing Knuckle Ring+2.

Notes

The Moonlight Greatsword does not gain a damage increase from the Ring of Blades or Flynn's Ring (needs confirmation) since both rings only augment physical damage and the sword has none (unless upgraded to do so).

Infusing this weapon with the Enchanted path causes the entire magic-damage portion of the damage to turn into physical damage. This also causes it to benefit from the Ring of Blades and Flynn's Ring (needs confirmation),
and boosts physical-blocking (L1 while two handing) to 90%+ damage reduction. The special attacks (strong attacks) will do zero damage (but still retain their poise damage and durability loss).
Although you do gain a powerful INT-scaling pure physical-damage weapon that doubles as a decent shield.

Wielding a weapon without the required Strength and/or Dexterity will incur a penalty to the Physical damage of the weapon,
while lower-than-required Magic and/or Faith will reduce the Magic damage of the weapon.

Also keep in mind that your character gains a 100% bonus to Strength by wielding a weapon with both hands, thus reducing
the actual Strength required. For example, a character with 14 Strength can wield a Great Club (Requires 28 Strength)
properly if the weapon is held with both hands. (14 x 2 = 28)

Stat Bonuses:

The Stat Bonuses rating indicates the level of bonus damage you do with the weapon, based on the associated Stat.
This rating can be S, A, B, C, D, or E (in order from most to least bonus for the associated skill).
See Scaling for more information.
The Bonus Stats for a weapon are A/B/C/D/E/F:

A is the Strength stat bonus that influences the physical attack of the weapon.

B is the Dexterity stat bonus that influences the physical attack of the weapon.

C is the Intelligence stat bonus that influences the Magical attack of the weapon.

Determines the amount of stamina expended to block an incoming attack. A higher stability also allows you to block stronger
attacks without breaking guard and reduces the amount of stamina depleted from blocking attacks.

The weight of the weapon. Note that carrying over 70% of your Equip Weight will reduce the speed of your rolls, while going
over 100% will reduce your regular speed to walking and attempts to roll or backstep will leave you momentarily stunned.